TonkoTonko is a South Slavic masculine given name.In Croatian, it is a hypocorism of the name Antun and other cognates of Antonius.It is found in Slovene as a diminutive form of Anton, Antonij, and Antonijo in Slovenia.Given nameTonko Lonza, Croatian actorTonko Soljan, Croatian American film and television producerSurnamePaul Tonko, American politician